ATA6602-EK Atmel, ATA6602-EK Datasheet - Page 249

• Manufacturer Part Number: ATA6602-EK
• Manufacturer: Atmel

Specifications of ATA6602-EK

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Table 4-91.
4921E–AUTO–09/09
Status Code
(TWSR)
Prescaler Bits
are 0
0x08
0x10
0x38
0x40
0x48
0x50
0x58
Status of the 2-wire Serial
Bus and 2-wire Serial
Interface Hardware
A START condition has been
transmitted
A repeated START condition
has been transmitted
Arbitration lost in SLA+R or
NOT ACK bit
SLA+R has been transmitted;
ACK has been received
SLA+R has been transmitted;
NOT ACK has been received
Data byte has been received;
ACK has been returned
Data byte has been received;
NOT ACK has been returned
Status codes for Master Receiver Mode
After a repeated START condition (state 0x10) the 2-wire Serial Interface can access the same
Slave again, or a new Slave without transmitting a STOP condition. Repeated START enables
the Master to switch between Slaves, Master Transmitter mode and Master Receiver mode with-
out losing control over the bus.
No TWDR action or
No TWDR action or
No TWDR action or
No TWDR action or
Read data byte or
Read data byte or
Read data byte or
No TWDR action
No TWDR action
No TWDR action
To/from TWDR
Load SLA+R or
Read data byte
Read data byte
Load SLA+W
Load SLA+R
Application Software Response
STA
0
0
0
0
1
0
0
1
0
1
0
0
1
0
1
STO
0
0
0
0
0
0
0
0
1
1
0
0
0
1
1
To TWCR
TWINT TWEA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
X
X
X
X
X
X
X
X
X
X
X
0
1
0
1
Next Action Taken by TWI Hardware
SLA+R will be transmitted
ACK or NOT ACK will be received
SLA+R will be transmitted
ACK or NOT ACK will be received
SLA+W will be transmitted
Logic will switch to Master Transmitter mode
2-wire Serial Bus will be released and not
addressed Slave mode will be entered
A START condition will be transmitted when the
bus becomes free
Data byte will be received and NOT ACK will be
returned
Data byte will be received and ACK will be
returned
Repeated START will be transmitted
STOP condition will be transmitted and TWSTO
Flag will be reset
STOP condition followed by a START condition
will be transmitted and TWSTO Flag will be reset
Data byte will be received and NOT ACK will be
returned
Data byte will be received and ACK will be
returned
Repeated START will be transmitted
STOP condition will be transmitted and TWSTO
Flag will be reset
STOP condition followed by a START condition
will be transmitted and TWSTO Flag will be reset
ATA6602/ATA6603
249